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Thread: pond Ice ringg

  1. #1 pond Ice ringg 
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    does anyone know how or what forms these?


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    KJW
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    Wikipedia has an article about ice circles.


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    I don't think those are ice circles. Nothing about them has the hallmarks of ice circles - neither their appearance to their location far from shore. If they are ice circles, they're a species new to me.

    Ice circles form in flowing water in a restricted channel. Small pieces of ice collect and fuse, and the gyrating action of the water movement grinds them to circles.


    I notice, in this case, each one is centred in an ice "shallow" - where the ice is thinner.

    I'd say that the shallow areas were previously open to water, and the water slowly froze inward until there was just a hole.
    As the water level below rose and fell, it would well up through these holes and form irregular ice berms surrounding the holes.
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    Forum Radioactive Isotope zinjanthropos's Avatar
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    I first thought the holes were made by ice fishermen augering down through the ice. However there does appear to be a light coloured white border forming outwardly away from each hole that is actually in the shape of the discs KJW alluded to in the article.
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    How about kids throwing rocks?
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    Forum Radioactive Isotope zinjanthropos's Avatar
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    Meteorites?
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    They look to be "blow holes" where water has forced its way up through weak spots in the ice cover. Depending on if the ice is on a lake or a river the conditions will differ.....
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    Forum Radioactive Isotope zinjanthropos's Avatar
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    I agree with Dave. They look like they're the centre of a depression in the ice sheet.
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    Quote Originally Posted by Paleoichneum View Post
    They look to be "blow holes" where water has forced its way up through weak spots in the ice cover. Depending on if the ice is on a lake or a river the conditions will differ.....
    This is a better description of what I'm thinkin'
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    Quote Originally Posted by zinjanthropos View Post
    I agree with Dave. They look like they're the centre of a depression in the ice sheet.
    I don't think they're depressions; I think they are areas of thin ice. i.e.

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  12. #11  
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    Quote Originally Posted by Paleoichneum View Post
    They look to be "blow holes" where water has forced its way up through weak spots in the ice cover. Depending on if the ice is on a lake or a river the conditions will differ.....
    Is that a reason for the concentric circles of frozen slush. Like a tree ring, documenting intervals of time where the ice thickness changed or the water levels below it rose or fell?
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